From what I have read, supposedly Klipsch finally addressed the issue that had so many of their sub plate amps fail prematurely. I would still be hesitant to get one unless the deal was stellar, which $650 doesn't qualify. Considering the HSU VTF-2 mk5 is currently $577/shipped and has nearly the same output in 2 port mode as the R-115, I see no reason to get the Klipsch. The HSU is smaller, has tuning flexibility and can be operated in 3 different port modes, including sealed. I would pocket the $73 and go with the more reliable HSU.
Subs>RBH I-12e, I-12. HSU VTF-15H mk2. Monolith THX 12(x2)/THX 10(x2). XTZ 1X12. SVS PB-1000(x2). Speakers>JBL Studio 270/235c/230/225c, Arena 130/125c. Sony CS3/CS8/CS5. QA 3020i/3090Ci, 2020i/2000c. Monolith Cinema 5bs. Polk RTiA1/CSiA4. Other Audio>Sony MDR-Z7m2, MDR-V6, XB900n, XB700, XB32, XB31. Sennheiser HD58X, HD4.50, PC37X. Philips SHP9500. SIVGA SV004. HyperX Cloud PS4. TB Stealth300. LG FH6,RK8,RK7,PK5. HK Onyx Studio4(x2).